It is a small type of rock drill composed the power machine, working machine and air ... compress in one. It is a small type of rock drill composed the power machine, working machine and air ... made of sand casting, which is solid and durable.YN30A YN30E YNF30 Ignition system: platinum, high ignition intensity.YN30A-2 Ignition system: controllable silicon, contactless system, steady ...